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<FONT color="green">001</FONT>    <a name="line.1"></a>
<FONT color="green">002</FONT>    /*<a name="line.2"></a>
<FONT color="green">003</FONT>     * Copyright (C) 2009 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<FONT color="green">004</FONT>     *<a name="line.4"></a>
<FONT color="green">005</FONT>     * $Id: LZMADecompressor.html 2 2009-12-17 02:39:56Z archie.cobbs $<a name="line.5"></a>
<FONT color="green">006</FONT>     */<a name="line.6"></a>
<FONT color="green">007</FONT>    <a name="line.7"></a>
<FONT color="green">008</FONT>    package org.dellroad.lzma.client;<a name="line.8"></a>
<FONT color="green">009</FONT>    <a name="line.9"></a>
<FONT color="green">010</FONT>    import com.google.gwt.user.client.IncrementalCommand;<a name="line.10"></a>
<FONT color="green">011</FONT>    <a name="line.11"></a>
<FONT color="green">012</FONT>    import java.io.IOException;<a name="line.12"></a>
<FONT color="green">013</FONT>    import java.io.InputStream;<a name="line.13"></a>
<FONT color="green">014</FONT>    import java.io.OutputStream;<a name="line.14"></a>
<FONT color="green">015</FONT>    <a name="line.15"></a>
<FONT color="green">016</FONT>    import org.dellroad.lzma.client.SevenZip.Compression.LZMA.Chunker;<a name="line.16"></a>
<FONT color="green">017</FONT>    import org.dellroad.lzma.client.SevenZip.Compression.LZMA.Decoder;<a name="line.17"></a>
<FONT color="green">018</FONT>    <a name="line.18"></a>
<FONT color="green">019</FONT>    /**<a name="line.19"></a>
<FONT color="green">020</FONT>     * LZMA decompressor.<a name="line.20"></a>
<FONT color="green">021</FONT>     */<a name="line.21"></a>
<FONT color="green">022</FONT>    public class LZMADecompressor implements IncrementalCommand {<a name="line.22"></a>
<FONT color="green">023</FONT>    <a name="line.23"></a>
<FONT color="green">024</FONT>        private Chunker chunker;<a name="line.24"></a>
<FONT color="green">025</FONT>        private long length;<a name="line.25"></a>
<FONT color="green">026</FONT>        private IOException exception;<a name="line.26"></a>
<FONT color="green">027</FONT>    <a name="line.27"></a>
<FONT color="green">028</FONT>        /**<a name="line.28"></a>
<FONT color="green">029</FONT>         * Constructor.<a name="line.29"></a>
<FONT color="green">030</FONT>         *<a name="line.30"></a>
<FONT color="green">031</FONT>         * &lt;p&gt;<a name="line.31"></a>
<FONT color="green">032</FONT>         * Decompression will stop when one of the following is true:<a name="line.32"></a>
<FONT color="green">033</FONT>         * &lt;ul&gt;<a name="line.33"></a>
<FONT color="green">034</FONT>         * &lt;li&gt;An "end of file" marker is read from the compressed data&lt;/li&gt;<a name="line.34"></a>
<FONT color="green">035</FONT>         * &lt;li&gt;The decompressed output reaches the length encoded in the compressed data&lt;/li&gt;<a name="line.35"></a>
<FONT color="green">036</FONT>         * &lt;li&gt;The end of {@code input} is reached&lt;/li&gt;<a name="line.36"></a>
<FONT color="green">037</FONT>         * &lt;/ul&gt;<a name="line.37"></a>
<FONT color="green">038</FONT>         *<a name="line.38"></a>
<FONT color="green">039</FONT>         * &lt;p&gt;<a name="line.39"></a>
<FONT color="green">040</FONT>         * The input and output streams will &lt;em&gt;not&lt;/em&gt; be closed when the operation completes.<a name="line.40"></a>
<FONT color="green">041</FONT>         *<a name="line.41"></a>
<FONT color="green">042</FONT>         * @param input compressed input<a name="line.42"></a>
<FONT color="green">043</FONT>         * @param output uncompressed output<a name="line.43"></a>
<FONT color="green">044</FONT>         * @throws IOException if {@code input} or {@code output} causes an exception<a name="line.44"></a>
<FONT color="green">045</FONT>         * @throws IOException if the compressed data is truncated or corrupted<a name="line.45"></a>
<FONT color="green">046</FONT>         */<a name="line.46"></a>
<FONT color="green">047</FONT>        public LZMADecompressor(InputStream input, OutputStream output) throws IOException {<a name="line.47"></a>
<FONT color="green">048</FONT>            init(input, output);<a name="line.48"></a>
<FONT color="green">049</FONT>        }<a name="line.49"></a>
<FONT color="green">050</FONT>    <a name="line.50"></a>
<FONT color="green">051</FONT>        LZMADecompressor() {<a name="line.51"></a>
<FONT color="green">052</FONT>        }<a name="line.52"></a>
<FONT color="green">053</FONT>    <a name="line.53"></a>
<FONT color="green">054</FONT>        void init(InputStream input, OutputStream output) throws IOException {<a name="line.54"></a>
<FONT color="green">055</FONT>            byte[] properties = new byte[5];<a name="line.55"></a>
<FONT color="green">056</FONT>            for (int i = 0; i &lt; properties.length; i++) {<a name="line.56"></a>
<FONT color="green">057</FONT>                int r = input.read();<a name="line.57"></a>
<FONT color="green">058</FONT>                if (r == -1)<a name="line.58"></a>
<FONT color="green">059</FONT>                    throw new IOException("truncated input");<a name="line.59"></a>
<FONT color="green">060</FONT>                properties[i] = (byte)r;<a name="line.60"></a>
<FONT color="green">061</FONT>            }<a name="line.61"></a>
<FONT color="green">062</FONT>            Decoder decoder = new Decoder();<a name="line.62"></a>
<FONT color="green">063</FONT>            if (!decoder.SetDecoderProperties(properties))<a name="line.63"></a>
<FONT color="green">064</FONT>                throw new IOException("corrupted input");<a name="line.64"></a>
<FONT color="green">065</FONT>            long expectedLength = -1;<a name="line.65"></a>
<FONT color="green">066</FONT>            for (int i = 0; i &lt; 64; i += 8) {<a name="line.66"></a>
<FONT color="green">067</FONT>                int r = input.read();<a name="line.67"></a>
<FONT color="green">068</FONT>                if (r == -1)<a name="line.68"></a>
<FONT color="green">069</FONT>                    throw new IOException("truncated input");<a name="line.69"></a>
<FONT color="green">070</FONT>                expectedLength |= ((long)r) &lt;&lt; i;<a name="line.70"></a>
<FONT color="green">071</FONT>            }<a name="line.71"></a>
<FONT color="green">072</FONT>            this.length = expectedLength;<a name="line.72"></a>
<FONT color="green">073</FONT>            this.chunker = decoder.CodeInChunks(input, output, this.length);<a name="line.73"></a>
<FONT color="green">074</FONT>        }<a name="line.74"></a>
<FONT color="green">075</FONT>    <a name="line.75"></a>
<FONT color="green">076</FONT>        /**<a name="line.76"></a>
<FONT color="green">077</FONT>         * Process the next chunk of data. If an {@link IOException} is thrown during processing,<a name="line.77"></a>
<FONT color="green">078</FONT>         * this returns {@code false} and {@link #getException} will return the caught exception.<a name="line.78"></a>
<FONT color="green">079</FONT>         *<a name="line.79"></a>
<FONT color="green">080</FONT>         * @return {@code true} if there is more work to do, otherwise {@code false}<a name="line.80"></a>
<FONT color="green">081</FONT>         * @throws IllegalStateException if this compression operation has already completed<a name="line.81"></a>
<FONT color="green">082</FONT>         */<a name="line.82"></a>
<FONT color="green">083</FONT>        public boolean execute() {<a name="line.83"></a>
<FONT color="green">084</FONT>            try {<a name="line.84"></a>
<FONT color="green">085</FONT>                return this.chunker.processChunk();<a name="line.85"></a>
<FONT color="green">086</FONT>            } catch (IOException e) {<a name="line.86"></a>
<FONT color="green">087</FONT>                this.exception = e;<a name="line.87"></a>
<FONT color="green">088</FONT>                return false;<a name="line.88"></a>
<FONT color="green">089</FONT>            }<a name="line.89"></a>
<FONT color="green">090</FONT>        }<a name="line.90"></a>
<FONT color="green">091</FONT>    <a name="line.91"></a>
<FONT color="green">092</FONT>        /**<a name="line.92"></a>
<FONT color="green">093</FONT>         * Determine how much of the output data has been generated so far.<a name="line.93"></a>
<FONT color="green">094</FONT>         * If a length of {@code -1} was encoded in the compressed data, then this always returns zero.<a name="line.94"></a>
<FONT color="green">095</FONT>         *<a name="line.95"></a>
<FONT color="green">096</FONT>         * @return a value from 0.0 to 1.0<a name="line.96"></a>
<FONT color="green">097</FONT>         */<a name="line.97"></a>
<FONT color="green">098</FONT>        public double getProgress() {<a name="line.98"></a>
<FONT color="green">099</FONT>            if (this.length == -1)<a name="line.99"></a>
<FONT color="green">100</FONT>                return 0.0;<a name="line.100"></a>
<FONT color="green">101</FONT>            return (double)this.chunker.getOutBytesProcessed() / (double)this.length;<a name="line.101"></a>
<FONT color="green">102</FONT>        }<a name="line.102"></a>
<FONT color="green">103</FONT>    <a name="line.103"></a>
<FONT color="green">104</FONT>        /**<a name="line.104"></a>
<FONT color="green">105</FONT>         * Get the exception thrown during the previous execution round, if any.<a name="line.105"></a>
<FONT color="green">106</FONT>         * &lt;b&gt;Note:&lt;/b&gt; this method must be checked after compression is complete to determine<a name="line.106"></a>
<FONT color="green">107</FONT>         * if there was an error.<a name="line.107"></a>
<FONT color="green">108</FONT>         *<a name="line.108"></a>
<FONT color="green">109</FONT>         * @return thrown exception, or {@code null} if none was ever thrown<a name="line.109"></a>
<FONT color="green">110</FONT>         */<a name="line.110"></a>
<FONT color="green">111</FONT>        public IOException getException() {<a name="line.111"></a>
<FONT color="green">112</FONT>            return this.exception;<a name="line.112"></a>
<FONT color="green">113</FONT>        }<a name="line.113"></a>
<FONT color="green">114</FONT>    }<a name="line.114"></a>
<FONT color="green">115</FONT>    <a name="line.115"></a>




























































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